![]() We currently provide three types of diagnostics, one of which has two levels of detail. Without this step, you'll lose your traces. Stopping the diagnostics allows the engine to collect the recorded traces and parse them into the proper output. It's important that if you're recording all traces from Start Diagnostics that you press Stop diagnostics. This can make it much easier to get a narrow view into a problem. It then shows you the diagnostics for that step, without showing you the diagnostics for other steps in the query. When you press Diagnose Step, Power Query runs a special evaluation of just the step you're looking at. Other system-generated queries might include the navigator or the get data experience. For example, with the SQL connector, when you retrieve a list of values to filter, that would kick off an evaluation as well-but it doesn't associate with a user query, and that's represented in the diagnostics. The evaluation that most users think of is when you press refresh, or when you retrieve data for the first time, but there are many actions that can cause evaluations, depending on the connector. Whenever you start diagnostics, Power Query begins tracing any evaluations that you cause. This selection constrains you from being able to trace diagnostics when doing a full refresh into Power BI rather than the Power Query editor, but does allow you to still use it when previewing, authoring, and so on. ![]() If you find yourself unable to run Query Diagnostics, open the Power BI options page, and in the Diagnostics tab, select Enable in Query Editor (does not require running as admin). To use Query Diagnostics, go to the Tools tab in the Power Query editor ribbon.īy default, Query Diagnostics might require administrative rights to run (depending on IT policy). ![]() While we'll be expanding on this feature in the future, including adding the ability to use it during full refreshes, at this time you can use it to understand what sort of queries you're emitting, what slowdowns you might run into during authoring refresh, and what kind of background events are happening. With Query Diagnostics, you can achieve a better understanding of what Power Query is doing at authoring and at refresh time in Power BI Desktop.
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